Abstract
In this paper, a software-defined radio (SDR) based transceiver system is designed and implemented on the system-on-chip (SoC) platform, which consists of a high-speed Arm embedded processor and a reconfigurable field-programmable gate array (FPGA). In the proposed SDR transceiver, the real-time baseband signal generation and adaptive digital predistortion (ADPD) units are implemented on the SoC platform. Memory polynomial model based ADPD solution is implemented to linearize the radio frequency (RF) power amplifiers (PAs). The implementation of the ADPD on a reconfigurable FPGA platform makes the system flexible and cost-effective. The PA characterization, in terms of model extraction and coefficient calculation, is done in real-time. These calculated coefficients are updated in the transmission path to precondition the transmitted signal before it is applied to the PA. The proposed ADPD is applied at the baseband level. Therefore, it can be used for different classes of PA operating at different RF carrier frequencies. A long-term evolution (LTE) signal with 20 MHz bandwidth and 11 dB peak to average power ratio (PAPR) is used for simulation and measurement purposes. The LTE signal is amplified using a GaN-based harmonically tuned continuous Class-F PA in measurement. The performance of the implemented ADPD scheme is analyzed in terms of NMSE, ACPR and EVM.
Highlights
As technology is growing, advanced wireless communication devices have become an essential part of the everyone’s daily life
Embedded processors provide: (1) communication between the software-defined radio (SDR) platform and user interface to display the system performance, (2) allow the user to design different applications required for SDR and digital predistortion (DPD) implementation, (3) software control over transceiver parameters along with radio frequency (RF) front end and (4) reading and writing data to and from the field-programmable gate array (FPGA) and RF front end board [35]
A DPD platform for SDR transceiver is developed for advanced long-term evolution (LTE) signals
Summary
As technology is growing, advanced wireless communication devices have become an essential part of the everyone’s daily life. Embedded processors provide: (1) communication between the SDR platform and user interface to display the system performance, (2) allow the user to design different applications required for SDR and DPD implementation, (3) software control over transceiver parameters along with RF front end and (4) reading and writing data to and from the FPGA and RF front end board [35]. These features provide high-level performance and service quality in the communication link. The output of PDUs is summed together to generate the predistorted signal, which is passed to the RF transceiver board for transmission
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